# What is the slope of a line perpendicular to the x-axis?

##### 2 Answers

undefined

#### Explanation:

the slope of a line parallel to the

the slope of a line perpendicular to another will have a slope which is its negative reciprocal.

the negative reciprocal of a number is

the negative reciprocal of

this is undefined, since one cannot define the value of any number that is divided by

We say vertical lines have "no slope," horizontal lines have zero slope. The equation is

#### Explanation:

One may use a direction vector,